Mental toughness is something we could all stand to gain. John Corcoran at The Art of Manliness suggests displaying your different duties—or job descriptions—to yourself so you can be the soldier of your own life and keep strong.

We all wear many different hats in our life and have many different duties. We are husbands and wives, boyfriends and girlfriends, fathers and mothers, children and siblings, mentors and students. When the going gets tough see what you're supposed to be doing for the different people in your life and summon a sense of duty:

Write down a "job description" for all the different hats you wear in your life. Not just for your work, but in the other roles you fulfill, like husband, father, and mentor. Tape these descriptions in a place where you will see them often or keep them in a notebook and review them weekly. No matter your different responsibilities, treat them like duties... When times get tough, and you're fatigued, annoyed, bored, and stressed, remember that it's your duty to get your job done.

It's important to look out for number one, but we sometimes forget what we said we'd do for others. Remember that people in your life are counting on you for things and suck it up. Be the person that takes care of the things you're supposed to and the things you say you'll do.